21244445403 has 8 divisors (see below), whose sum is σ = 29992158288. Its totient is φ = 13329848064.

The previous prime is 21244445401. The next prime is 21244445413. The reversal of 21244445403 is 30454444212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21244445403 - 2¹ = 21244445401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21244445401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208278826 + ... + 208278927.

It is an arithmetic number, because the mean of its divisors is an integer number (3749019786).

Almost surely, 2^21244445403 is an apocalyptic number.

21244445403 is a deficient number, since it is larger than the sum of its proper divisors (8747712885).

21244445403 is a wasteful number, since it uses less digits than its factorization.

21244445403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416557773.

The product of its (nonzero) digits is 61440, while the sum is 33.

Adding to 21244445403 its reverse (30454444212), we get a palindrome (51698889615).

The spelling of 21244445403 in words is "twenty-one billion, two hundred forty-four million, four hundred forty-five thousand, four hundred three".